#Denotatus Subzone fossil

[uk-fossils]

RARE Aegasteroceras sagittarium Ammonite Fossil – Lower Jurassic, Frodingham Ironstone Formation, Scunthorpe UK

Available here is a rare and scientifically significant ammonite fossil, Aegasteroceras sagittarium, collected from the Frodingham Ironstone Formation at Conesby Quarry, Scunthorpe, North Lincolnshire, England. This beautifully preserved specimen dates to the Lower Jurassic, specifically the Denotatus Subzone of the Obtusum Zone within the Lower Lias Group.

Fossil Type & Species:

Type: Ammonite (Extinct Cephalopod Mollusc)

Species: Aegasteroceras sagittarium

Known for its robust shell with distinct ribbing and inflated whorls

Geological Context:

Period: Mesozoic Era

System: Jurassic

Epoch: Early Jurassic

Stage: Hettangian to Sinemurian

Zone: Obtusum Zone

Subzone: Denotatus Subzone

Formation: Frodingham Ironstone Formation (part of the Lias Group)

Depositional Environment: Shallow marine shelf with iron-rich muds and sands. These environments supported diverse marine life and provided ideal conditions for fossil preservation, particularly within ironstone nodules and lenses.

Morphological Features:

Strongly ribbed, inflated shell

Involute coiling with a compressed to moderately depressed whorl section

Fine suture patterns often visible on well-preserved specimens

Characteristic features that distinguish Aegasteroceras from other Lower Lias ammonites

Scientific Importance:

Aegasteroceras sagittarium is a biostratigraphically important species in the Denotatus Subzone, used for correlation within Lower Jurassic marine sequences in the UK

This fossil offers insight into ammonite evolution shortly after the end-Triassic extinction event

Material from Scunthorpe localities is considered highly collectible and stratigraphically precise

Locality Information:

Conesby Quarry, Scunthorpe, North Lincolnshire, UK – an important Lower Jurassic locality yielding exceptionally preserved ammonites from the Frodingham Ironstone Formation

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. The photographs in the listing show the exact fossil you will receive. Please refer to the image for full sizing, with the scale cube = 1cm.

This is a premium ammonite specimen of Aegasteroceras sagittarium, ideal for collectors, educators, and those with a passion for British Jurassic palaeontology.

Add a well-documented Lower Jurassic ammonite fossil to your collection—an authentic relic from over 190 million years ago!

[uk-fossils]

RARE 4.5" ASTEROCERAS STELLARE Ammonite Fossil Lower Jurassic Frodingham Ironstone Scunthorpe UK Authentic Specimen

This listing features a RARE 4.5" ammonite fossil of Asteroceras stellare, found in the Frodingham Ironstone Formation at Conesby Quarry, near Scunthorpe, North Lincolnshire, England. This beautifully preserved specimen is from the Lower Lias Group, specifically the Denotatus Subzone of the Obtusum Zone, Lower Sinemurian Stage, and comes with a Certificate of Authenticity.

Asteroceras stellare is a classic species from the early Jurassic and belongs to:

Order: Ammonitida

Superfamily: Psilocerataceae

Family: Arietitidae

This ammonite is a key component of the early Sinemurian marine fauna and is used biostratigraphically to correlate Lower Jurassic strata across Europe. The Frodingham Ironstone Formation was deposited in a shallow marine, iron-rich sedimentary environment, dating to approximately 199–197 million years ago.

Morphological Features:

Large, evolute shell with widely spaced whorls

Coarse radial ribbing extending across the venter

Broad umbilicus with strong, well-defined ornamentation

Suture lines with distinct lobes and saddles

These features not only make Asteroceras stellare highly recognisable, but also highly desirable for collectors and researchers alike due to its preservation, rarity, and size.

Specimen Details:

Species: Asteroceras stellare

Fossil Type: Ammonite Shell

Size: 4.5 inches (11.5 cm approx.)

Geological Formation: Frodingham Ironstone Formation

Biozone/Subzone: Obtusum Zone / Denotatus Subzone

Geological Stage: Lower Sinemurian, Lower Jurassic

Location: Conesby Quarry, Scunthorpe, North Lincolnshire, England

Depositional Environment: Shallow marine, iron-rich platform

Family: Arietitidae

This is a rare opportunity to own a museum-grade specimen of a 4.5" ammonite from a classic Lower Jurassic British locality. Ideal for display, study, or as a centrepiece in any fossil collection.

Scale rule squares/cube = 1cm. Please refer to the photo for accurate size and detail.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

[uk-fossils]

Rare Aegasteroceras Ammonite Fossil Lower Jurassic Scunthorpe UK | Denotatus Subzone Frodingham Ironstone Genuine Specimen

This listing features a rare Aegasteroceras ammonite fossil, originating from the historically significant Conesby Quarry, Scunthorpe, in North Lincolnshire, England. It is preserved within the Frodingham Ironstone Formation and dates to the Lower Jurassic, specifically the Obtusum Zone and Denotatus Subzone of the Lower Lias Group.

This genuine specimen is shown in the listing photographs and is the exact item you will receive. It has been carefully selected for its rarity, scientific value, and visual appeal.

Geological & Palaeontological Details:

Genus: Aegasteroceras

Fossil Type: Ammonite

Family: Arietitidae (tentative placement)

Superfamily: Psiloceratoidea

Order: Ammonitida

Geological Period: Jurassic

Epoch: Early Jurassic

Stage: Lower Sinemurian

Biozone: Obtusum Zone, Denotatus Subzone

Formation: Frodingham Ironstone Formation

Location: Conesby Quarry, Scunthorpe, North Lincolnshire, England

Depositional Environment: Shallow epicontinental sea with iron-rich marine sediments. The Frodingham Ironstone represents a transgressive systems tract within the Cleveland Basin, known for its rich ironstone and marine fossil content.

Morphology & Features:

Aegasteroceras is notable for its evolute coiling, strong radial ribbing, and robust shell profile

It often exhibits deep constrictions and a well-defined umbilicus

This specimen shows classic ribbing and coiling, allowing for secure identification

Preserved in an iron-rich matrix typical of the Scunthorpe ironstone beds, adding a distinctive aesthetic and scientific interest

Notability: Fossils of Aegasteroceras are exceptionally rare, especially from Scunthorpe's Denotatus Subzone, making this a sought-after collector’s item and an important piece for biostratigraphic correlation. The genus was originally described by Spath (1925), a pioneer in Lower Jurassic ammonite taxonomy.

Additional Details:

All our fossils are 100% genuine specimens

Supplied with a Certificate of Authenticity

Photo shows the exact fossil for sale

Scale cube = 1cm – please refer to listing images for full size reference

A remarkable fossil for display, research, or education. This ammonite captures a window into the iron-rich seas of Early Jurassic Britain and represents a rare piece of paleontological heritage from a historically important UK locality.

[uk-fossils]

VERY RARE: 7.5" Eparietites impendens Fossil Ammonite (Macroconch) | Lower Jurassic | Scunthorpe, England | Certified Authentic

This listing presents a VERY RARE 7.5" Eparietites impendens Fossil Ammonite (Macroconch) from the Frodingham Ironstone Formation, Denotatus Subzone, Obtusum Zone, Lower Lias, dating back to the Lower Jurassic (~200 million years ago). Discovered in the historic Conesby Quarry, Scunthorpe, North Lincolnshire, England, this is a prime example of an iconic Jurassic ammonite.

Eparietites impendens is renowned for its large, coiled shell and distinctive ribbing. The macroconch form, often considered the female variant, is notably larger than its microconch counterpart. This specimen exhibits excellent preservation with visible suture patterns and intricate shell details, making it a highly desirable addition to any serious fossil collection.

Fossil Information:

Species: Eparietites impendens (Macroconch)

Fossil Type: Ammonite

Geological Formation: Frodingham Ironstone Formation

Stratigraphy: Denotatus Subzone, Obtusum Zone, Lower Lias

Age: ~200 million years old (Lower Jurassic)

Location: Conesby Quarry, Scunthorpe, North Lincolnshire, England

Size: 7.5 inches (Full sizing provided in photos)

Preservation: Excellent preservation with clear suture lines and shell texture

Key Features:

✔ Extremely Rare Eparietites impendens Fossil (Macroconch)

✔ From the renowned Lower Jurassic strata of Scunthorpe

✔ Museum-grade preservation with detailed suture patterns

✔ Perfect for Collectors, Museums, and Educational Displays

Authenticity & Certification:

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The fossil shown in the photos is the exact specimen you will receive.

Why Buy From Us?

This ammonite fossil is part of the prestigious Alice Purnell Collection, one of the largest and most respected fossil collections in the world. We specialize in high-quality, museum-grade fossils, making this a perfect addition for serious collectors, educators, and researchers.

🌊 Own a rare piece of Jurassic marine history—add this Eparietites impendens fossil ammonite to your collection today!

[uk-fossils]

Very Rare 9" Asteroceras Sectioned & Polished Fossil Ammonite, Lower Jurassic, Obtusum Zone, Conesby Quarry, Scunthorpe, UK – Ex Alice Purnell Collection

This listing features a very rare 9" Asteroceras sectioned and polished fossil ammonite from the Frodingham Ironstone Formation, Denotatus Subzone, Obtusum Zone, Lower Lias, Lower Jurassic. Discovered at Conesby Quarry, Scunthorpe, North Lincolnshire, England, this exquisite specimen is both a scientific marvel and a stunning display piece, dating back approximately 195 million years.

The Asteroceras genus is known for its beautifully coiled shells and intricate suture patterns, which are magnificently highlighted in this sectioned and polished specimen. The polished surface reveals the internal chambers of the ammonite, showcasing its natural mineralization and stunning details, offering a fascinating glimpse into the fossilization process. Its size, rarity, and polished finish make it an exceptional addition to any collection or display.

This remarkable fossil comes from the world-renowned Alice Purnell Collection, one of the largest and most prestigious private ammonite collections globally. Fossils from this collection are celebrated for their authenticity, historical significance, and outstanding preservation, adding immense value to any piece.

Key Details:

Species: Asteroceras (ammonite)

Size: 9 inches

Age: Lower Jurassic, Obtusum Zone (~195 million years old)

Formation: Frodingham Ironstone

Location: Conesby Quarry, Scunthorpe, North Lincolnshire, UK

Provenance: Alice Purnell Collection

This fossil is 100% genuine and comes with a Certificate of Authenticity, ensuring its scientific and collectible value. The exact specimen you will receive is shown in the photos, with a scale rule featuring 1cm squares for accurate size reference.

This Asteroceras fossil ammonite, with its sectioned and polished finish, is a stunning example of natural history and a unique addition to any fossil collection. Its combination of rarity, exceptional preservation, and aesthetic appeal makes it ideal for collectors, educators, and enthusiasts of Earth’s prehistoric treasures.

Don’t miss the opportunity to own this rare and beautifully polished Asteroceras ammonite fossil from the esteemed Alice Purnell Collection. Order now to secure this exceptional piece of Earth’s history for your collection!